Friederich sohlatter



F. SGHLATTERQ MIOROMETER GAGE.

(No ModeL) Patented July 30, 1889;

NV PETERS. Phumuma m her. wahin m. 0.0

FRIEDERICH SOHLATTER, OF MADRETSOH, SVITZERLAND.

MICROMETER-GAGE.

I SPECIFICATION forming part of Letters Patent No. 407,903, dated July30, 1889.

Application filed February 19, 1889. Serial No. 300,498- (No model.)Patented in Switzerland December 31, 18 88, No. 303.

To all whom it may concern.-

Be it known that I, FRIEDERICH SCHLAT- TER, a citizen of the Republic ofSwitzerland, residing at Madretsch, in the Republic of Switzerland, haveinvented certain new and useful Improvements in MicrometricalMeastiring-Instruments, (for which I have obtained Letters Patent inSwitzerland, N o. 303, dated December 31, 1888,) of which the followingis a specification.

This invention relates to improvements in that class ofmeasuring-instruments that are used for measuring very small dimensions,such as the thickness of paper, fabrics, sheet metal, wire, &c.

The object of my invention is to provide a measuring-instrument of thiskind which permits of reading off the dimensions of the article at anydesired time after the measurement has been taken.

The invention consists in the construction and combination of parts anddetails, as will be fully described and set forth hereinafter, andfinally pointed out in the claims.

In the accompanying drawings, Figure 1 is a face view of my improvedmeasuring-instrument. Fig. 2 is a vertical longitudinal sectional viewof the same on the line on 0:, Fig. 3. Fig. 3 is a vertical transversesectional View of the same on the line y 11 Fig. 2. Fig. 4 is anelevation of the upper half portion of the instrument, the pointer beingprovided with a nonius. Fig. 5 is an enlarged detail face view of thefingered arm. Fig. 6 is a side view of the same.

Similar letters of reference indicate corresponding parts.

The casing A,Which is provided at its lower end with a recess 0 in oneside edge, contains the slide B, provided with the abutting surface B,which is opposite the other abutting surface formed by the end of ascrew C, which is adjustable in the bottom arm 0 of the casing A, andcan be locked in place by means of a suitable nut P. The slide B isprovided'on its upper end with a head A. In the casing an arbor L isjournaled, 011 which is mounted a pinion K, that engages a rack 1),formed on one edge of a longitudinal slot b in the slide B. On the outerend of the arbor L an arm H is fixed and adapted to rotate over a dialE, fixed on thefront of the casing and provided with a circulargraduated scale. To the free end of the arm H the finger n ispivoted,which is provided at its hinged end with the two shoulders orstops n or W, that can rest against the pin 01 on the arm H. A spring2', secured to the arm H and bearing against a pin a" of the finger n,keeps said finger in line with the arm H and the stop 92 against the pin17/, as shown in Fig. 5. A pointer G is mounted onahub J on the arbor L,and said pointer G is provided with a proj ecting-pin g, on which thefinger n of the arm H can act.

The glass R over the dial is held in a ring D, mounted to rotate on theplate F, on which the dial E is held, and said ring D is provided withthe pin Q, which is to be used for adjusting the apparatus forcontrolling certain measurements.

The slide B is providedwitha longitudinal slot B containing the spiralspring M, of which one end bears against the pin N, projecting from thecase 0 into said slot and the other end bears against the upper end ofthe slot B thus pressing the slide B upward. If desired, the pointer orhand G may be pro vided with a nonius W for very accurate measurements.

The operation is as follows: WVhen the abutting surfaces B and C are asfar apart as possible, the hand or pointer G is at O, and when the saidabutting surfaces are brought in contact the hand or pointer G will havemade one revolution from right to left, and will again be at O. Thearticle to be measured is placed upon the abutting surface 0 and theslide B pressed down until the surface B rests upon the said article. Bypressing down the slide B the arm H is rotated from right to left, andits finger it strikes against the pin 9 on the pointer or hand G, andalso turns the same from right to left. If the object is very small, theslide B can be depressed farther than if the object is larger, and thusfor a smallobj ect the hand or pointer G will be moved farther to theleft than for a larger object. As the graduated. scale is subdividedfrom left to right, it follows that as the hand G rotates from right toleft it gradually passes over the lower numerals of the scale. When theslide B is released, the spring M throws it upward and brings the arm Hback to its initial position, the hand G remaining in the position inwhich it indicates the dimension of the article measured. Measurementscan thus be taken with the abovedescribed instrument in the dark and themeasurements read off when the instrument is brought into light, as thehand G retains its position. i I

To bring the hand G back to O on the dialscale, the slide B is pusheddown until the surfaces B and O are in contact, the object having beenremoved. Thereby the arm H is caused to make one complete revolutionfrom right to left, and in so doing carries the hand G around to 0. Ifthe slide B is now released, the spring M throws it upward and the arm His caused to makea complete revolution from left to right. In so doingthe end of the finger n swings to the left, where it strikes against thepin 9 and passes under said pin, the spring t bringing said finger intothe normal position as soon as the pin g'has been passed.

Having thus described my invention, I claim as new and desire to secureby Letters Patent 1. In a measuring-instrument, the combination of acasing provided with a dial, a slide in said casing provided with arack, an arbor in said casing provided with a pinion which is engaged bysaid rack, an arm fixed on said arbor, a hand mounted on said arbor overthe dial and provided with a pin which is engaged ing spring-finger, ahand mounted to swing over the dial and provided with a pin on which thespring-finger of the arm can act, and a spring abutting against a fixedpoint of the casing and pressing the slide upward, substantially as setforth.

3. In a measuring-instrument, the combination of the casing 13 and theslide 0, having the slots B and b, the latter having the v rack Z)formed on one edge, the arbor L, the pinion K on the same engaging therack b, the spring M in the slot B the dial E on the casing, the arm Hon the arbor L, the finger n, pivoted on said arm, the spring *6,secured to the arm H, actingon the finger n, and the hand G, mounted torotate over the dial and provided with the pin g, on which the finger ncan act, substantially as set forth.

In testimony that I claim the foregoing as my invention I have signed myname in presence of two subscribing witnesses.

FRIEDERIOH SCHLATTER.

Witnesses:

BOYD WVINcHEsTER, JoHANN Woman.

